I had almost the same thing happen to me. I activated the elevator platform with my Tav, and while the rest of the party stayed on the moving platform, my Tav just stayed where she was and fell off as the elevator moved forwards. This resulted in her falling through the terrain and dying. And as she succeeded all of her death saving throws and is therefore stable, I can't resurrect her with Withers. She is blocked by terrain, so spells (even aoe), grenades, arrows can't get to her. I can neither kill her nor heal her. I can neither long rest nor fast travel with the rest of my party, and reloading didn't solve the issue, Tav is still stuck in the same place inside the rockwork of the Gauntlet.
If anyone knows of any workaround, it would be much appreciated. This is the second major bug for me in my HM run after the goblin leader/Halsin bug... only that this time it looks like my run is defintely over.
The most well known workaround is to use short rest (which revives the downed character) and then teleport out of the Gauntlet.
